Process for producing molded article made of synthetic resin
CA 2189673 C · Owner: Takeuchi, Atsushi · Inventors: Ohgane, Hitoshi; Makuta, Minoru; Takeuchi, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In producing a molded article of a synthetic resin the, following steps are used: a step of injecting an outer layer forming material into a molding cavity through a gate in a mold; a step of injecting a core forming material to allow the core forming material to flow into the outer layer forming material existing in the gate and the cavity and to allow the outer layer and core forming materials to flow within the cavity thereby, advancing the formation of the first construction portion; a step of allowing a front portion of the core forming material in a flowing direction to break through a front portion of the outer layer forming material in the flowing direction to flow into said cavity, …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 5, 1996 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.